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Loans - Amortized cost basis of collateral-dependent loans (Details) - USD ($)
Jun. 30, 2025
Jun. 30, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total Collateral Dependent Loans $ 66,645 $ 0
Residential | One-to-four-family residential    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total Collateral Dependent Loans 66,645  
Real Estate Secured Loans    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total Collateral Dependent Loans 66,645  
Real Estate Secured Loans | Residential | One-to-four-family residential    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total Collateral Dependent Loans $ 66,645